EP3437797B1 - Procédé de détermination de la position d'un élément de lentille optique - Google Patents

Procédé de détermination de la position d'un élément de lentille optique Download PDF

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Publication number
EP3437797B1
EP3437797B1 EP17306029.4A EP17306029A EP3437797B1 EP 3437797 B1 EP3437797 B1 EP 3437797B1 EP 17306029 A EP17306029 A EP 17306029A EP 3437797 B1 EP3437797 B1 EP 3437797B1
Authority
EP
European Patent Office
Prior art keywords
optical lens
lens member
points
blocking ring
during
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17306029.4A
Other languages
German (de)
English (en)
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EP3437797A1 (fr
Inventor
Jérôme Moine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Priority to EP17306029.4A priority Critical patent/EP3437797B1/fr
Priority to PL17306029T priority patent/PL3437797T3/pl
Priority to US16/623,895 priority patent/US11964355B2/en
Priority to BR112019024671-1A priority patent/BR112019024671A2/pt
Priority to PCT/EP2018/070565 priority patent/WO2019025352A1/fr
Priority to CN201880039385.9A priority patent/CN110740837B/zh
Publication of EP3437797A1 publication Critical patent/EP3437797A1/fr
Application granted granted Critical
Publication of EP3437797B1 publication Critical patent/EP3437797B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B24B13/0055—Positioning of lenses; Marking of lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00028—Bifocal lenses; Multifocal lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00951—Measuring, controlling or regulating
    • B29D11/00961—Measuring, controlling or regulating using microprocessors or computers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00951—Measuring, controlling or regulating
    • B29D11/0098—Inspecting lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses

Definitions

  • the present invention relates to a method implemented by computer means, for determining the position of an optical lens member having a surface placed on a lens blocking ring and to a method of manufacturing an optical surface of an optical lens.
  • a method according to the preamble of claim 1 is for example known from WO- 2014/102385 A1 .
  • An optical lens is typically made of plastic or glass material and generally has two opposing surfaces which co-operate with one another to provide a required corrective prescription. When the positioning or shape of one of these surfaces with respect to the other is inaccurate, optical errors can be created.
  • Manufacturing of an optical lens to the required prescription requirements typically includes machining the surface of a semi-finished lens or lens blank.
  • a semi-finished lens has a finished surface, for example the front surface and an unfinished surface, for example the back surface.
  • the manufacturing method comprises a blocking step during which the semi-finished lens is blocked on a blocker.
  • the semi-finished lens is maintained by temporarily clamping the finished surface of the lens on a blocking ring.
  • Various materials may be employed to secure the semi-finished lens to the blocking insert, previously placed below the SF lens. These materials may include low temperature fusible metal alloys and thermoplastic materials.
  • the position of the optical lens on the blocking ring can be of great importance so as to assure an accurate position of the manufactured surface relative to the finished surface.
  • progressive ophthalmic lenses include a combination of two complex surfaces, for example two aspherical surfaces, such as two progressive or regressive surfaces.
  • two aspherical surfaces such as two progressive or regressive surfaces.
  • the relative position of both surfaces is of great importance for the optical function of the manufactured ophthalmic lens. Therefore, the semi-finished lens member is to be blocked in an accurate position during the blocking step or at least one needs to be able to determine the blocking position.
  • a goal of the present invention is to provide a method for determining the position of an optical lens member having a surface placed on a lens blocking ring.
  • the invention proposes a method implemented by computer means according to claim 1.
  • the method according to the invention considers the position of the projection on the main plane of the point of application of the force applied to the optical lens member when blocked. Considering the projection of the force provides a more accurate position of the optical lens member than the prior art methods.
  • the method of the invention can work with all types of surfaces, without requiring to adapt the calculation strategy, and is flexible to adapt to any blocker configuration in term of clamping arm location.
  • the invention further relates to a method of manufacturing an optical surface of an optical lens comprising:
  • the invention also relates to an optical lens, for example an ophthalmic lens such as a progressive multifocal ophthalmic lens, manufactured according to a manufacturing method of the invention.
  • an optical lens for example an ophthalmic lens such as a progressive multifocal ophthalmic lens, manufactured according to a manufacturing method of the invention.
  • a computer program product comprising one or more stored sequences of instructions that are accessible to a processor and which, when executed by the processor, causes the processor to carry out the steps of the method according to the invention.
  • a computer readable medium carrying one or more sequences of instructions of the computer program product according to the invention.
  • the invention also relates to a computer-readable storage medium having a program recorded thereon; where the program makes the computer execute the method of the invention.
  • the invention further relates to a device comprising a processor adapted to store one or more sequence of instructions and to carry out at least one of the steps of the method according to the invention.
  • a "Design” is a widely used wording known from the man skilled in the art to designate the set of parameters allowing to define an optical function of a generic optical system; each ophthalmic lens manufacturer has its own designs, particularly for aspherical lens and for progressive lens.
  • a progressive lens "design” results of an optimization of the progressive surface so as to restore a presbyope's ability to see clearly at all distances but also to optimally respect all physiological visual functions such as foveal vision, extra-foveal vision, binocular vision and to minimize unwanted astigmatisms.
  • Progressive lens "designs" are tested through rigorous clinical trials before being commercialized.
  • optical lens member can refer to a lens blank, an uncut lens, a semi-finished lens. It will be understood that the method can thus be applied to any stage of the manufacturing process of an ophthalmic lens.
  • a method for manufacturing an optical lens comprises:
  • an optical lens member is provided, for example a semi-finished optical lens.
  • the optical lens member 10 has a first surface with a first design, for example a preformed aspherical front surface.
  • the preformed front surface 11 is disposed nearest the object being viewed.
  • the optical lens member 10 further comprises a second surface 12 to be modified by the manufacturing method so as to provide for example the back surface 13 of the finished optical lens, represented by the dotted line.
  • Second surface 12 is machined by a machining tool so that the back surface 13 is orientated with respect to and distanced from the front surface 11, according to a required optical prescription.
  • first surface is the front surface of the lens member and the second surface is the back surface
  • first surface may be the back surface of the lens member and the second surface may be the front surface
  • the back surface of the optical lens is formed by the manufacturing method, it will be understood, that in alternative embodiments of the invention both or either surfaces of the lens may be formed by the manufacturing method.
  • reference markings 111 are provided on the first surface 11 of the lens member 10 as reference features for defining a first reference system for positioning of the first design of the first surface.
  • the reference markings 111 may be engraved markings have a depth of a few micrometers so as to limit the risk of disturbing the wearer of the resulting finished optical lens.
  • the reference markings may also be temporary markings, for example using a removable ink.
  • the reference markings 111 are positioned such as they do not appear on resulting finished optical lens after edging operations.
  • the first surface 11 of the lens member 10 is placed on a lens blocking ring 22.
  • a blocking cast material is poured in the cavity 24 defined by the first surface 11, the lens blocking ring 22 and a top surface (not represented) of an insert 21.
  • the optical lens member 10 is represented has having a first surface 11 spherical, the invention is most advantageous for optical lens member 10 having an aspherical first surface.
  • a blocking station 30 may be used for the optical lens member blocking step.
  • the blocking station 30 comprises a clamping arm 35 which may be moved from a free position to a clamping position in which it holds the lens member 10 in place on the lens blocking ring 22.
  • Blocking station 30 also includes a digital camera 36 for taking an image of the positioning of the lens member 10 on the blocking ring 22, and a screen 37 for viewing the image from the digital camera 36.
  • the lens member 10 may also be directly viewed by an operator without using the digital camera 36.
  • the optical lens is clamped using the clamping arm 35.
  • the casting material may then be poured in the cavity 24.
  • the operator uses the digital camera and the screen 37 to visualize reference markings on the first surface 11 of the lens member 10.
  • the image of the reference markings 111 on the first surface 11 of the lens member 10 is compared to a computer-generated target on the screen 37.
  • the operator places the lens member so that the image of the reference markings 111 of the first surface 11 of the lens member 10 and the computer-generated target superpose.
  • the position of the lens member 10 is defined in a reference system comprising a main axis Z perpendicular to a main plane (X, Y) defined by two axes X, Y perpendicular to each other and to the main axis Z.
  • the position of the lens member, in particular of the first surface 11 of the lens member 10 in such reference system is defined by six parameters. Among the six parameters, three are translation parameters TX, TY and TZ along each axis X, Y, and Z and three are rotation parameters RX, RY, and RZ about each of the axis X, Y, and Z.
  • the reference system is also shown on figure 3 .
  • an operator controls only three of the six parameters, i.e. the rotation RZ about the main axis Z and the translations TX and TY along the axis X and Y.
  • Three complementary position parameters TZ, RX and RY are constrained by the shape of the first face and the shape of the bearing zone.
  • the other three complementary position parameters TZ, RX and RY are to be determined accurately using computer means and an appropriate method.
  • the three rotation parameters are of great importance.
  • the method of the invention is such an appropriate method.
  • the method of the invention may be implemented by computer means and comprises finding a trio of points of the bearing zone that forms a triangle comprising the projection on the main plane of the point of application of said force; and a position of the optical lens having a virtual contact between the placed known surface and the ring at the location of said trios of points.
  • the method according to the invention comprises:
  • a reference system comprising a main axis (Z) perpendicular to a main plane (X, Y) is provided.
  • the main plane (X,Y) is defined by two axes perpendicular to each other and to the main axis (Z).
  • the center (O) of such reference system is defined as the intersection point of the main axis (Z) with the main plane (X, Y).
  • the main axis (Z) corresponds to the main direction of the force applied on the optical lens member, for example by the clamping arm 35.
  • blocking ring data is provided.
  • the blocking ring data represents at least the bearing zone of the blocking in the reference system.
  • the bearing zone is the part of the blocking ring arranged to bear at least partially the placed known surface of the optical lens member.
  • Different type of blocking ring may be used during the optical lens member blocking step.
  • the blocking ring may be in the form of a bearing ring having three bearing areas for contact with a semi-finished blank arranged circumferentially around an axis and at the vertices of an isosceles triangle, each bearing area having a plurality of facets which conjointly form a globally convex combination.
  • Another type of blocking ring comprises three pegs, each peg having a cylindrical body that is extended by a spherical surface head. The first surface of the optical lens is placed on the spherical surface heads.
  • the use of such blocking ring combined with an appropriate method provides a good control of the blocking position of the optical lens member.
  • such blocking ring remains expensive to produce.
  • a production blocking ring may simply comprise an annular bearing zone 23 having globally a circular symmetry about an axis Z.
  • the bearing zone is arranged to bear at least partially the placed surface of the optical lens member when said optical lens member is placed on the blocking ring.
  • the bearing zone is located within the main plane and the center of the reference system is located at a geometrical center of the bearing zone 23.
  • the blocking ring has a cylinder shape whose revolution axis is parallel to the main axis (Z).
  • the blocking ring may have a constant height along the main axis.
  • the shapes of the blocking rings tend to be as simple as possible so as to reduce the cost of such blocking ring.
  • the clamping arm 35 of the blocking station usually has an offset, i.e. the point of the second surface of the lens member where the clamping arm is clamped does not correspond to the center of the lens member and the placed known surface of the lens member is usually asymmetric.
  • the bearing zone may represent only part of the surface of the blocking ring: the part that is to be in contact with the placed known surface of the lens member.
  • the bearing zone 23 has a circular shape and may be comprised in a plane perpendicular to the main axis (Z).
  • the bearing zone data represent an arc of the blocking ring, the arc having an angle greater than or equal to 60°, for example greater than or equal to 120°, for example greater than 170°, and smaller than or equal to 300°, for example smaller than or equal to 240°, for example smaller than 190°.
  • the summit of the arc is positioned at the geometrical center of the bearing zone.
  • the blocking ring data comprises data representing, in the reference system provided during the reference system providing step, a plurality of point of the bearing zone.
  • the plurality of points comprises at least three points, for example at least 10 points, for example the blocking ring data comprise one point per degrees over the bearing area.
  • the blocking ring data comprise points arranged so as they are spaced by an angular distance greater than or equal to 0.5° and smaller than or equal to 2°.
  • the reference of the angles is the center of the blocking ring.
  • optical lens member surface data providing step S3 optical lens member surface data are provided.
  • the optical lens member surface data represent the known surface of the optical lens to be placed on the blocking ring.
  • the optical lens member surface data are expressed in the reference system.
  • the optical lens member surface data represent the first surface 11 of the lens member 10.
  • the optical lens member surface data is a representation at least twice derivable of the placed surface of the optical lens member.
  • the optical lens surface member surface data may be a surface function representation of the optical surface, using for example NURBS representations, i.e. NonUniform Rational Basis Splines.
  • the placed surface may be asymmetric, for example aspherical.
  • position parameters of the placed surface are provided.
  • the position parameters define the position of a reference point of the surface of the optical lens to be placed on the blocking ring in the main plane of the reference system and the orientation of said surface about the main axis of the reference system.
  • the position parameters correspond to the parameters the operator may control when placing the lens member on the blocking ring, i.e. the rotation RZ about the main axis Z and the translations TX and TY along the axis X and Y.
  • RX, RY and TZ are controlled through the clamping arm and contact with the blocking ring
  • TX, TY and RZ are controlled by an operator by aligning a reference point of the first surface on a reference marks located on the blocking station.
  • the optical lens member is used to manufacture an ophthalmic lens.
  • the reference point of the surface of the optical lens member to be placed on the center of the blocking ring may be any point of the surface, for example when the optical lens is a progressive ophthalmic lens, the reference point is the prism reference point.
  • the geometrical center of the first surface or the barycenter of the first surface can be used as reference point.
  • the bearing zone is sampled into a plurality of points, the points being regroup in a set of trios.
  • the bearing zone is sampled with a 30° angular sampling.
  • the bearing zone is annular such sampling defines 12 points equally distributed.
  • trio selection step S6 trios of points whose projection on the main plane form a triangle are selected.
  • trio selection step only the trios of points forming a triangle comprising the projection on the main plane of the point of application of force are selected.
  • the method of the invention may comprise an initial position determining step S6b during which the position of the placed surface of the optical lens member is determined.
  • an initial position of the placed surface of the optical lens member relative to the blocking ring is determined.
  • the blocking ring is placed in the main plane (X,Y) and perpendicular to the main axis Z.
  • the placed surface is placed relatively to the blocking ring according to the three positioning parameters.
  • the three other parameters TZ, RX, and RY may be given an arbitrary value under the condition that the placed surface of the optical lens is above the blocking ring.
  • the optical lens is a progressive multifocal ophthalmic lens and during the initial positioning step, the placed surface is oriented so as to have the near vision part of the progressive multifocal ophthalmic lens facing the at least part of the surface of the blocking ring.
  • the parameter corresponding to the rotation about the main axis Z is so that the placed surface is oriented so as to have the near vision part of the progressive multifocal ophthalmic lens facing the bearing zone of the blocking ring.
  • the optical lens may be placed so that the clamping arm in the clamping position pushes against the near vision part of the progressive multifocal ophthalmic lens.
  • the optical lens is a progressive multifocal ophthalmic lens and during the initial positioning step, the placed surface is oriented so as to have the far vision part of the progressive multifocal ophthalmic lens facing the at least part of the surface of the blocking ring.
  • the parameter corresponding to the rotation about the main axis Z is so that the placed surface is oriented so as to have the far vision part of the progressive multifocal ophthalmic lens facing the bearing zone of the blocking ring.
  • the optical lens may be placed so that the clamping arm in the clamping position pushes against the far vision part of the progressive multifocal ophthalmic lens. Since the far vision part of the progressive multifocal ophthalmic lens has a surface close to a sphere, the contact between the optical surface and the blocking ring is easier and the risk of a having some of the cast material leaking during the blocking steps is reduced.
  • the known surface of the optical lens is virtually rotated about the two perpendicular axes (X;Y) so that the plane formed by the three projected points of the each triple of points on the known surface of the optical lens is parallel to the plan formed by the three projected points of said each triple of points on the ring, and the known surface is virtually translated along the main axis (Z) to have a virtual contact between the tilted surface and the ring at the location of said trios of points.
  • the repositioning step is repeated for each trio of points, eliminating each trio of points for which the difference in position along the main axis between the points of the blocking ring data and the corresponding points of the known surface of the optical lens is negative, and finally selecting one of the remaining trios as the final trio of point.
  • the final trio of points may be selected as being the one of the remaining trios of points corresponding to a position having an orientation parameters (RX, RY) defining the orientation about one of the axis defining the main plan the closest to the average orientation parameter over the positions corresponding to the remaining trios of points.
  • orientation parameters RX, RY
  • the orientation parameters RX and RY of the corresponding position are calculated.
  • the orientation parameter having the greatest amplitude among the remaining trio of points is selected.
  • the final trio of points is selected among the remaining trios of points corresponding to a position having the selected orientation parameter the closest from the average value of said selected orientation parameter over the positions corresponding to the remaining trio of points.
  • the values of the position parameters TZ, RX, and RY combined with the values of the position parameters RZ, TX and TY allows calculating an accurate position for the placed surface with respect to the blocking ring and then to the lens blocker.
  • the positioning errors between the two optical surfaces of the lens can be reduced, because the position of first surface was better anticipated in the calculation.
  • the overall accuracy of the manufacturing method is increased.
  • the sampling, the trio selection and the repositioning steps may be repeated by sampling the bearing zone with a smaller sampling around each of the points of the selected trio of points.
  • the sampling is divided by two.
  • the optimization of the method of the invention may be stopped when sampling is smaller or equal to 2°.
  • the trio selection and the repositioning steps are repeated until the sampling is smaller or equal to 2°.
  • the method of the invention may also be carried out until the values of the rotation angles about the two perpendicular axes (X;Y) differ of less than 5% from the values of said rotation angles determined at the previous repetition.
  • stop criteria are described as independent the method of the invention may be stopped when the one of the two criteria is reached, i.e. sampling smaller or equal to 2° and the values of the rotation angles about the two perpendicular axes (X;Y) differ of less than 5% from the values of said rotation angles determined at the previous repetition
  • optimization used in the method of the invention may be of any type known of the person skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Eyeglasses (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Lens Barrels (AREA)

Claims (13)

  1. Procédé mis en œuvre par des moyens informatiques pour déterminer la position d'un élément de lentille optique ayant une surface placée sur un anneau de blocage de lentille, l'anneau de blocage comprenant une zone d'appui agencée pour supporter au moins partiellement une surface connue placée de l'élément de lentille optique lorsque ladite surface connue de l'élément de lentille optique est placée sur l'anneau de blocage de lentille et est maintenue par une force appliquée sur l'élément de lentille optique, le procédé comprenant :
    - une étape de fourniture de système de référence (S1) au cours de laquelle un système de référence est fourni, le système de référence comprenant un axe principal (Z) perpendiculaire à un plan principal (X,Y) défini par deux axes perpendiculaires entre eux et à l'axe principal (Z), l'axe principal (Z) correspondant à la direction principale de la force appliquée sur l'élément de lentille optique,
    - une étape de fourniture de données sur l'anneau de blocage (S2) au cours de laquelle des données sur l'anneau de blocage sont fournies, les données sur l'anneau de blocage représentant la zone d'appui dans le système de référence,
    - une étape de fourniture de données de surface d'élément de lentille optique (S3), au cours de laquelle des données de surface d'élément de lentille optique sont fournies, les données de surface d'élément de lentille optique représentant, dans le système de référence, la surface connue de l'élément de lentille optique à placer sur l'anneau de blocage,
    - une étape de fourniture de paramètre de position (S4) au cours de laquelle des paramètres de position sont fournis, les paramètres de position (TX, TY, RZ) définissant la position d'un point de référence de la surface connue par rapport au plan principal du système de référence et une orientation, autour de l'axe principal de ladite surface connue au niveau dudit point de référence,
    - une étape d'échantillonnage (S5) au cours de laquelle la zone d'appui est échantillonnée en une pluralité de points, les points étant regroupés en un ensemble de trios, le procédé étant caractérisé en ce qu'il comprend les étapes supplémentaires suivantes :
    - une étape de sélection de trios (S6) au cours de laquelle sont sélectionnés des trios de points dont la projection sur le plan principal forme un triangle comprenant la projection sur le plan principal du point d'application de la force ;
    - une étape de repositionnement (S7) au cours de laquelle la surface connue de la lentille optique est virtuellement mise en rotation autour des deux axes perpendiculaires (X;Y) de manière à ce que le plan formé par les trois points projetés de chaque triplet de points sur la surface connue de la lentille optique soit parallèle au plan formé par les trois points projetés de chaque dit triplet de points sur l'anneau, et la surface connue est virtuellement translatée le long de l'axe principal (Z) pour avoir un contact virtuel entre la surface inclinée et l'anneau à l'endroit desdits trios de points ;
    - une étape de sélection (S8) au cours de laquelle l'étape de repositionnement est répétée pour chaque trio de points, en éliminant chaque trio de points pour lequel la différence de position le long de l'axe principal entre les points des données de l'anneau de blocage et les points correspondants de la surface connue de la lentille optique est négative, et, enfin, en sélectionnant l'un des trios restants comme trio final de points.
  2. Procédé selon la revendication 1, dans lequel l'anneau de blocage a un axe de symétrie qui correspond à l'axe principal (Z).
  3. Procédé selon la revendication précédente, dans lequel, pendant l'étape d'échantillonnage, la zone d'appui est échantillonnée avec un échantillonnage angulaire de 30°.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel les étapes d'échantillonnage, de sélection de trio et de repositionnement sont répétées en échantillonnant la zone d'appui avec un échantillonnage plus petit autour de chacun des points du trio de points sélectionné.
  5. Procédé selon la revendication 4, dans lequel, lors de la répétition des étapes de sélection de trio et de repositionnement, l'échantillonnage est divisé par deux.
  6. Procédé selon l'une quelconque des revendications 4 ou 5, dans lequel les étapes de sélection de trio et de repositionnement sont répétées jusqu'à ce que l'échantillonnage soit inférieur ou égal à 2°.
  7. Procédé selon l'une quelconque des revendications 4 à 6, dans lequel les étapes de sélection de trio et de repositionnement sont répétées jusqu'à ce que les valeurs des angles de rotation autour des deux axes perpendiculaires (X;Y) diffèrent de moins de 5 % des valeurs desdits angles de rotation déterminées lors de la répétition précédente.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel les données de l'anneau de blocage comprennent des points espacés d'une distance angulaire supérieure ou égale à 0,5° et inférieure ou égale à 2°.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel la zone d'appui de l'anneau de blocage est comprise dans un plan perpendiculaire à l'axe principal (Z).
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'élément optique est utilisé pour fabriquer une lentille ophtalmique multifocale progressive et le point de référence de la surface connue est le point de référence du prisme de la lentille ophtalmique multifocale progressive.
  11. Procédé selon la revendication précédente, dans lequel la surface connue est orientée de manière à ce que la partie de vision de près de la lentille ophtalmique multifocale progressive soit tournée vers la zone d'appui.
  12. Procédé selon la revendication 10, dans lequel la surface connue est orientée de manière à ce que la partie de vision de loin de la lentille ophtalmique multifocale progressive soit tournée vers la zone d'appui.
  13. Procédé de fabrication d'une surface optique d'une lentille optique comprenant :
    - une étape de fourniture d'un élément de lentille optique, au cours de laquelle est fourni un élément de lentille optique ayant une première surface optique et une seconde surface optique à fabriquer,
    - une étape de blocage au cours de laquelle la première surface de l'élément de lentille optique est placée sur un anneau de blocage et bloquée sur un élément de lentille de maintien,
    - une étape de fabrication au cours de laquelle la seconde surface de la lentille optique est fabriquée conformément à des paramètres de fabrication,
    où la position de la première surface de l'élément de lentille optique sur l'anneau de blocage à l'étape de blocage est déterminée en utilisant un procédé selon l'une quelconque des revendications 1 à 12.
EP17306029.4A 2017-08-02 2017-08-02 Procédé de détermination de la position d'un élément de lentille optique Active EP3437797B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17306029.4A EP3437797B1 (fr) 2017-08-02 2017-08-02 Procédé de détermination de la position d'un élément de lentille optique
PL17306029T PL3437797T3 (pl) 2017-08-02 2017-08-02 Sposób określania pozycji członu soczewki optycznej
US16/623,895 US11964355B2 (en) 2017-08-02 2018-07-30 Method of determining the position of an optical lens member
BR112019024671-1A BR112019024671A2 (pt) 2017-08-02 2018-07-30 Método de determinação da posição de um membro de lente óptica
PCT/EP2018/070565 WO2019025352A1 (fr) 2017-08-02 2018-07-30 Procédé permettant de déterminer la position d'un élément de lentille optique
CN201880039385.9A CN110740837B (zh) 2017-08-02 2018-07-30 确定光学镜片构件的位置的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17306029.4A EP3437797B1 (fr) 2017-08-02 2017-08-02 Procédé de détermination de la position d'un élément de lentille optique

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EP3437797A1 EP3437797A1 (fr) 2019-02-06
EP3437797B1 true EP3437797B1 (fr) 2020-05-13

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EP (1) EP3437797B1 (fr)
CN (1) CN110740837B (fr)
BR (1) BR112019024671A2 (fr)
PL (1) PL3437797T3 (fr)
WO (1) WO2019025352A1 (fr)

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DE102023201930A1 (de) 2023-03-03 2024-09-05 Rodenstock Gmbh Bestimmung der Lage einer optischen Linse in Bezug auf eine Auflage oder Halterung

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JP3966696B2 (ja) * 2001-03-26 2007-08-29 株式会社ニデック カップ取付け装置
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Publication number Publication date
US20210146495A1 (en) 2021-05-20
PL3437797T3 (pl) 2020-11-16
EP3437797A1 (fr) 2019-02-06
BR112019024671A2 (pt) 2020-06-16
CN110740837A (zh) 2020-01-31
WO2019025352A1 (fr) 2019-02-07
US11964355B2 (en) 2024-04-23
CN110740837B (zh) 2021-08-17

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